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-==================================
-TWserial device subsystem analysis
-==================================
-
-Tomas Hlavacek<tmshlvck@gmail.com>
-2012-03-21
-
-I) Overview
------------
-
-U-Boot currently implements one common API for TWSerial devices. The interface
-is defined in include/tws.h and comprises of functions:
-
- int tws_read(uchar *buffer, int len);
- int tws_write(uchar *buffer, int len);
-
-The functions are implemented by a proper device driver in drivers/twserial
-directory and the driver to be compiled in is selected in a Makefile. There is
-only one driver present now.
-
-The driver depends on ad-hoc code in board specific data, namely functions:
-
- void tws_ce(unsigned bit);
- void tws_wr(unsigned bit);
- void tws_clk(unsigned bit);
- void tws_data(unsigned bit);
- unsigned tws_data_read(void);
- void tws_data_config_output(unsigned output);
-
-implemented in include/configs/inka4x0.h .
-
-II) Approach
-------------
-
- U-Boot TWserial drivers exports two simple functions and therefore the conversion
- of the driver and creating a core for it is not needed. It should be consolidated
- with include/configs/inka4x0.h and taken to the misc/ dir.
-
-
-III) Analysis of in-tree drivers
---------------------------------
-
- drivers/twserial/soft_tws.c
- ---------------------------
- The driver is the only TWserial driver. The ad-hoc part in
- include/configs/inka4x0.h and the core soft_tws driver should be consolidated
- to one compact driver and moved to misc/ .